Commitments and Contingencies (Future Minimum Payments Under Non-Cancelable Operating Leases, Along with Sublease Income Amounts) (Details) $ in Millions	Dec. 31, 2016 USD ($)
Operating Leases
2017	$ 843
2018	902
2019	910
2020	854
2021	767
Thereafter	3,694
Total minimum payments	7,970
Sub-lease Income
2017	15
2018	6
2019	5
2020	4
2021	2
Thereafter	1
Total minimum payments	33
Net Operating Leases
2017	828
2018	896
2019	905
2020	850
2021	765
Thereafter	3,693
Total minimum payments	$ 7,937

Operating Leases, Future Minimum Payments Due, Net, Fiscal Year Maturity [Abstract]

No definition available.

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- Definition

Amount of required minimum rental payments maturing in the next fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year, net of minimum rental payments receivable in the next fiscal year following the latest fiscal year for operating subleases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

No definition available.